More Problems

• Implement a function to determine if a string is a valid URL.
• Create a program to check if a number is a quadratic residue modulo p.
• Write a program to calculate the total number of unique characters in a string.
• Implement a function to find the maximum sum of a contiguous subarray.
• Create a program to determine if a number is a palindromic prime.
• Write a program to compute the number of ways to express a number as a sum of two squares.
• Implement a function to find the longest increasing subsequence in an array.
• Create a program to check if a number is a Keith number.